Nearly 30 years ago, scientists began collecting semen samples from Mexican wolves. On Sunday, Brookfield Zoo artificially inseminated one wolf as part of an effort to boost the genetic health of the endangered species.

The Chicago-based fast food chain agreed last year to work toward phasing out antibiotics from its beef and pork products. An Illinois nonprofit now wants McDonald’s to commit to a timeline to meet that goal.

The group Crate Free Illinois is calling on Trader Joe’s to stop purchasing pork from suppliers that use gestation crates, tight metal stalls that keep pigs in one position for the majority of their lives.

Brookfield Zoo is leading a first-of-its-kind study to collect data from dolphins and other aquatic mammals using a Fitbit-like device that figures to revolutionize human understanding of the animals’ behavior.